Thermostat-motor.



v COSBY ID. MILLER, :OF ST. JOSEPH, MISSOUBZI, KSSIGNOR :DETBOIT MOTORAPfLIANGE CQMPAN. Y,;,OF DETROIT, MICHIGAN, A CORPORATION-F MICHIGAN. i1

Specification of letters Patent,

Patented 0a. 26,":1915.

Application filed March 9, 1915. Serial 1i 0. 18,235.

' To all whomit may concern:

Be it known that I, Cosnx iD. LMILLER, a

' citizen of the United States, residing atSt.

' said parts are extremely substantial and are not materially worn, fromlong and con-' Joseph, in the countyof Buchanan and State of Missouri,have invented certain 'new and useful Improvements in Thermostat-Motors,of which the following is a specification,

reference being had therein to the .accdm-f panying drawing My inventionrelates to improvements in thermostat motors, the.-'o'bj'ects of whichare,

to provide a highly efiicien't mechanism of this class, in whichthe'form and arrange ment of the parts are ;such, that the number of theparts is reduced to the minimum, that stant use;the reby; providing .athermostat .I motor that is thoroughly :reliahleLi-n .its op- 'eration,and is extremely cheap in cost of manufacture.

Further objects are, to provide substantial movement limitmg devices,whereby the expansive movement of the diaphragms is limited, therebypreventing over expansion and consequent injury to thediaphragms, suchas fracture of the same {or opening of the joint at their edges.

Still further objects are to provide ready securing meansior easily andquickly securing the motor to a fixed object, in operative position, andalso, to provide aconnecting device, whereby the motor can be connectedwith other mechanisms, for thermostatically operating the same,withperfec't freedom inf movement, other than spring resistance, untilthe expansive limitof the diaphragms is reached.

' tion, similar to showing the thermophragms.

I attain these objects the mechanism illustrated in the accompanyingdrawings,- v in which Figure -1 is a vertical section of the motor onthe line X seen in Fig. 2, showing the thermostat contracts Fig. 2 is atop of the parts seen in ig. 1. Fig. 3 is a secextremelyedge 2. Saidportion 2 snugly fits inside of portion .1, with said edges 2 and 1"forming a channel between them, which is filled with solder 3, thusforming a liquid tightjoint, that is not affected by expansion andcontraction of said diaphragms as heiremafiter described. Diaphragm 2has filling aperture 2 formed-therethrough, through which terminates inthe inwardly extended which a volatile liquid L is passed, until thespace between said diaphragms is filled with said liquid. Said fillingaperture then closed with solder 2. I Said diaphragmsare preflerablyformed of die stamped spring stee Bottom spring 3 and top spring 4 areof the same shape and size, and for use on diaphragms of ordinary size,as :sh'owm said. springs are made in the form of .a cross, each vhavingthe four radially extended arms 3 and 4 'nespectively, while for use-onlarger diaphragms, a greater plurality of said arms may be used. Saidsprings each have a central aperture 3"" an'd 4, respectively formedtherethrough. Each one of" said ams has a clip aperture '3 4, re-.spectively formed through their outer ends.

Said springs-and their arms are preferably die stamped from springsteel.

Reduced portion :5. i seat post 5 is through aperture '3 and is headedon-the top I ofgspring '3. Saidjp'ost is provided with screw screwedinto a threaded aperture? formed in the lower end portion thereof.

.Said screw has head 6 formed thereon, .for

securing the motor on a fixed object, not

shown. Connection stud 7 is seemed to it, being passed through its aerltnre 4.. Said stud has annular channel "r formed therein, is adaptedto receive the bifurcated end of a lever, thus formed, (said "leverbeing not shownfl or said channel-may he engaged wlth other engageableiorm or movement conveying means, for conveying movemeettherefrom'to-any other various mecha-' d 1 msms, such as dampers,shutters, etc.

thicker The four clips '8 are formed of 'inaterial than said diaphragms,:ifor greater -1'1g1'd1ty, and are preferably die stamped fromfheaviersheet metal clips each have studs 8. formed with; their endporti-ons,said studs being adapted to engage apertures 3 and 1'. Saidclips are-first formed of U shape, with their ends farther apart Inassembling the parts, springs and 4 are placed in--.the position shownand the studded ends of said clips are crimped into scribedethermostatmotor rises, in temperature, liquid L becomes expanded thereby,

' I which causes the parts to move from the po- Fig. 3, if saidtemperature hast-reached the highest degree in which the motor isdesition seen in Fig. 1, to the position seen in signed to, operate. Itwill be .;seen, that. while in the last mentionedposition, both of thediaphragms are expandedlinto the shapev of arcs by reasen-ofthe expandedliqs uid between them, which is permitted by their annular corrugations9 and 10, and that their marginal portions by reason of the form, aspreviously, described are, not' therebyl reduced in diameter. It willalsb be the edges of said diaphragm, and of solder seen that. thedescribed springs and their arms are similarly arced, which slidestheirfree ends inward'on said marginal portions, until said inward movementis stopped by oontact'of clips 5 against the'rigid'margin, formed of thepreviously-describedparts, of

Should said'temp'erature rise still farther, the expansive strain ofliquid L against said diaphragm's, thefarther expansion of the latter,and additional strain thereon, are

overcome by the thus held arms and 3 It will be understood that springs.said arms are elastic and together with their respective springs, act aselastic units. The previously described expansion of the thermostat,raises stud 7 .and the lowering of the latter is actuated by saidelastic units, when said tem erature is lowered, thereby causingcontraction of liquid .L.

Having fully described myinvention, what I'claim as new, and desiretosecure by Letters Patent, is

1. A pair of metal disks one disk being above the other; rigid marginalportions formed on the edgesof said disks; liquid tight joining meanswhereby the edges of said marginal portions are joined for holding avolatile liquid between said disks, the

'latter being adapted to' be ou'twardly;arced byexpansion of saidliquid; a top spring on the upper disk; a plurality of top springmembers evenly spaced and extending radi ally from said top spring; abottom spring .beneath the bottom of the lower disk; a like plurality ofsimilarly arranged bottom I spring members for said bottom spring, the

shaped clips ".post; securing means for rigidl ends of all'of saidspring ,members being adapted to, slide radially onssaid margin portionoff] id disk a plmqality of U' .bnyokiig the ends of said springmembersimpairs; and clip securing means whereby the ends of said clipsare-secured to the ends of said spring members, said clips .beingadapted to be moved in- Ward against said marginal portion for lim itinginward movement of the ends of said spring members; the whole beingadapted to limit expansive arcing of said. die

, phragrns.

2. In a thermostat motor, a pair of thermostat diaphragms holding aliquid between 4 themsaid liquid being adapted to be expanded byheat for.expansively moving and .80 thereby arcing said diaphragms; a rigid annular margin formed on the edges of said diaphragms; two flat springunits one of which is loosely applied to the outer surface of each ofsaid diaphragms said spring units being adapted to be moved into theform of arcs by said diaphragms; and connecting means extended aroundsaid margin whereby the outer extremities of said spring units areconnected, saidconnecting means being adapted to .be moved inward by thearcing =ofsaid spring and to have their inwar movementlimited-by contactwith said rigid margin; the whole being'adapted to limit the expansionof said diaphragms.

3. A diaphragm motor, comprising a seat securing said post on a fixedobject; a at bottom spring unit the centralportion of which isrigidly'secured on the upper end of said post; a pair of expansivediaphragms of disk form resting loosely upon said ottom spring .unitsaid diaphra ms havin the. edges thereof connected anf holding a fiquidbetween them that isexpanded by heat; a rigid annular edge portionformed of the edges of said disk; a flat top spring unit resting looselyon the upper one of sand die-- phragms; a plurality of unit 'connect'means whereby the outerextremities of units are connected said connectinmeans being extended around said rigid edge ortion a slight distancetherefrom; a .stud aving its lower end rigidly secured in the centralportion of said top s rin unit said stud havin achannel forine in t ea'nnularsurface t ereof; the whole bein adapted to thermostatically movesaid stu, upward and downward and to limit the movements of said stud.

In testimony whereof I aifix my signature in the presence of twowitnesses. COSBY D. MILLER.

Witnesses: I

JOHN J. HrNToN, MATI'HEW B. Hmron.

